🔍 mypy: Use a compatible syntax for multimethod

src/dinglehopper/character_error_rate.py

@@ -30,17 +30,15 @@ def character_error_rate_n(
     # XXX Should we really count newlines here?
 
 
-@multimethod
-def character_error_rate_n(reference: str, compared: str) -> Tuple[float, int]:
+@character_error_rate_n.register
+def _(reference: str, compared: str) -> Tuple[float, int]:
     seq1 = list(grapheme_clusters(unicodedata.normalize("NFC", reference)))
     seq2 = list(grapheme_clusters(unicodedata.normalize("NFC", compared)))
     return character_error_rate_n(seq1, seq2)
 
 
-@multimethod
-def character_error_rate_n(
-    reference: ExtractedText, compared: ExtractedText
-) -> Tuple[float, int]:
+@character_error_rate_n.register
+def _(reference: ExtractedText, compared: ExtractedText) -> Tuple[float, int]:
     return character_error_rate_n(
         reference.grapheme_clusters, compared.grapheme_clusters
     )

src/dinglehopper/edit_distance.py

@@ -19,8 +19,8 @@ def distance(seq1: List[str], seq2: List[str]):
     return Levenshtein.distance(seq1, seq2)
 
 
-@multimethod
-def distance(s1: str, s2: str):
+@distance.register
+def _(s1: str, s2: str):
     """Compute the Levenshtein edit distance between two Unicode strings
 
     Note that this is different from levenshtein() as this function knows about Unicode
@@ -32,8 +32,8 @@ def distance(s1: str, s2: str):
     return Levenshtein.distance(seq1, seq2)
 
 
-@multimethod
-def distance(s1: ExtractedText, s2: ExtractedText):
+@distance.register
+def _(s1: ExtractedText, s2: ExtractedText):
     return Levenshtein.distance(s1.grapheme_clusters, s2.grapheme_clusters)
 
 

src/dinglehopper/word_error_rate.py

@@ -60,8 +60,8 @@ def unwanted(c):
             yield word
 
 
-@multimethod
-def words(s: ExtractedText):
+@words.register
+def _(s: ExtractedText):
     return words(s.text)
 
 
@@ -70,8 +70,8 @@ def words_normalized(s: str):
     return words(unicodedata.normalize("NFC", s))
 
 
-@multimethod
-def words_normalized(s: ExtractedText):
+@words_normalized.register
+def _(s: ExtractedText):
     return words_normalized(s.text)
 
 
@@ -82,15 +82,13 @@ def word_error_rate_n(reference: str, compared: str) -> Tuple[float, int]:
     return word_error_rate_n(reference_seq, compared_seq)
 
 
-@multimethod
-def word_error_rate_n(
-    reference: ExtractedText, compared: ExtractedText
-) -> Tuple[float, int]:
+@word_error_rate_n.register
+def _(reference: ExtractedText, compared: ExtractedText) -> Tuple[float, int]:
     return word_error_rate_n(reference.text, compared.text)
 
 
-@multimethod
-def word_error_rate_n(reference: Iterable, compared: Iterable) -> Tuple[float, int]:
+@word_error_rate_n.register
+def _(reference: Iterable, compared: Iterable) -> Tuple[float, int]:
     reference_seq = list(reference)
     compared_seq = list(compared)